Twisting machine for conical cross bobbins, specially for artificial silk



Sept. 25, 1934. M, LENK 1,974,497

TWISTING MACHINE FOR CONICAL CROSS BOBBINS, SPECIALLY FOR ARTIFICIAL SILK Filed :r-i'l 18, 1929 ,6 1 :29.1,

Jhwnlar Patented Sept. 25, 1934 UNITED STATES PATENT OFFICE TWISTING MACHINE FOR CONICAL CROSS BOBBINS, SILK SPECIALLY FOR AETIFI Mathias Lenk, Lennep, Germany, assignor to the firm Banner Maschinenfabrlk Aktiengesellschaft, Barmen-Rittershausen, Germany Application April is, me, Serial No. 350,215 In Germany May 25, 1928 3 Claims. (Cl- 242-47) This invention relates to a twisting machine, specially for artificial silk which differs from similar machines of known type in that in the same on conical spools the twisting can be done at uniform rotation. The twisting on conical spools, which in comparison with cylindrical spools presents the advantage that the thread is pulled off over head, has hitherto been known only for ringand bell-twisting frames and could not be used in connection with twisting machines, as in such machines it is impossible to obtain uniform circumferential speed, when conical spools are used, owing to the lack of a suitable device which, on account of the conicity of the spool, could not be provided at the point where the thread is run on. Crosswinding was absolutely uneconomical in machines as hitherto used for conical spools, as the changing massesdid not admit of the required rapid changing.

According to the invention all these inconveniences are avoided by driving the conical spools by a crowned driving roll so that it is possible to twist the thread at permanently uniform pulling-off speed and rotation in any desired crossing.

The driving roll, which rotates the conical spool by friction, is either mounted on a changing bar and rotated by a lower cylinder, or it is keyed on a changing driving shaft and transmits thus its rotation directly by friction upon the conical spool. For obtaining the desired effect, the thread fixed on the changing element is arranged in the middle of the crowned driving roll.

An embodiment of the invention with the parts of the twisting machine necessary for explaining the invention is illustrated in the accompanying drawing in which:

Fig. 1 shows the arrangement in front elevation.

Fig. 2 is a vertical section on line 2--2 of Fig. 1.

Fig. 3 shows in elevation partly in section the mechanism effecting displacing of the reversing point of the curve.

Fig. 4 is a side elevation of Fig. 1.

Fig. 5 is a vertical section on line 5-5 of Fig. 1.

In the form of construction illustrated in the drawing the winding bobbin or the conical spool is driven by a raised curved guide rib on a cylinder or on an endless band and extending uniformly in a curve effecting the reciprocating movement of the thread guide.

The thread guide is mounted on a reciprocating bar at the middle of the curve guide rib and consequently moved accurately in accordance with the curve. The winding body rolls therefore merely in accordance to a curve corresponding to the movement of the thread guide so that the reciprocating movement of the driving element is omitted in this form of construction, wherefrom results the preservation of the thread owing to the omission of the friction.

On the driving shaft a sleeve is further arranged, shiftable in axial direction and having on two opposite points rollers guided in oblique grooves in the cylinder, so that at the reciprocating movement of this sleeve effected by a mechanical drive the reversing points of the curve effecting the reciprocating movement of the thread guide are situated on the circumference of said sleeve.

In the drawing a designates the uprights and c,

the shaft journaled in these uprights and driving the winding body or the conical spool b. The spool b is mounted in the arms of the bow is oscillatably mounted in arms I of the machine frame. On the shaft c a cylinder d is mounted, which has a raised curved rib d on which the winding bobbin 1) bears so that it is rotated by the rotating cylinder, the circumferential speed of the conical bobbin being always constant. The thread guide 71. is fixed on the reciprocating bar a in front of the raised rib d, at the middle of the curved rib said bar g forming a frame guided at the rear end in an upright f and carrying in its lower portion a a roller 1'. guided in a curved groove m extending similar as the curved rib d on the cylinder d and cut into a cylinder 11 mounted on shaft 0. The thread guide h, fixed on the bar a, is thus reciprocated by cylinder 1!- and moved to and fro according to the shape of the curved rib d. On the machine frame stationary yoke elements it" are provided which hold the slide t and serve at the same time as guide bearing for this slide during its reciprocating movement. The axial shifting of the sleeve 0 on the shaft is effected by a yoke member t engaging in a radial groove of the sleeve 0, which yoke member is mounted on a slide it which is reciprocated by an eccentric u driven by a worm gearing v, w. In Fig. 4 slide t has pulled out the sleeve 0 owing to the movement of the eccentric u, that is in its extreme right position, whereas Fig. 6 shows the slide it in its extreme left position. The sleeve 0 carries on its outer side diametrically opposite rollers p which engage in inclined slots 8 of a sleeve 1' fixed on the cylinder 'n. Both the cylinder n and the cylinder d are keyed on the shaft c and participate in the rotary movement thereof. During this rotary movement the sleeve Gil) o rotating therewith is slowly reciprccated by the yoke member at fitted on the slide it and shifted axially on the shaft c. The rollers running in the inclined slots of the sleeve 1', owing to the inclined arrangement oi the slots, impart additional movements to the cylinder n as the rollers mounted on the sleeve always move in the axial direction or the shaft. These additional movements cause an acceleration and retardation of the speed of rotation so that accelerations and retardations in the reverse of the thread guide occur, so that the reversing points are distributed around the entire circumference of the spool.

Owing to this distribution, however, a uniform laying of the thread on the circumference of the bobbin is avoided so that no fiat surface is produced.

The thread fed to the bobbin b is drawn over the head by a r tary twisting spindle not shown in the drawing, d thus receives its twisting. It is evident that this device can also be employed when no twist is imparted to the thread but the thread is merely rewound.

This machine can evidently be used also for textile machines of any kind and for such machines in which the thread has to be wound on winding spools or any shape, i. e. also on noncylindrical spools, as for instance for twisting machines, for conical cross winding and the like specially for twisting artificial silk.

I claim:-

l; A driving mechanism for conical spools on machines for twisting especially artificial silk, comprising in combination with the conical spool, a driving axle, a cylinder on said driving axle, a helical rib on said cylinder in contact with said conical spool, a reciprocating bar between said driving axle and said spool, a thread guide fixed on said bar and extending over said helical rib, a cam on said axle adapted to impart a reciprocating movement to said thread guide and having a groove curved similarly to said helical rib to conform the reciprocating movement of said thread guide to the path or said rib, a sleeve on said driving axle shiitable in axial direction, a cylinder having oblique grooves surrounding said sleeve, and rollers on said sleeve guided in the grooves in said cylinder to shift at the toand fro-movement of said sleeve the reversing points ravens? oi said cam efiecting the reciprocating movement of said thread guide.

2. A driving mechanism for conical spools on machines for twisting especially artificial silk, comprising in combination with the conical spool, a driving axle, a cylinder on said driving axle, a helical rib on said cylinder in contact with said conical spool, a reciprocating bar between said driving axle and said spool, a thread guide fixed on said bar and extending over said helical rib, a cam on said axle adapted to impart a reciprocating movement to said thread guide and having a groove curved similarly to said helical rib to conform the reciprocating movement of said thread guide to the path of said rib, a sleeve on said driving axle shiitable in axial direction and having a radial groove, a cylinder having oblique grooves surrounding said sleeve, rollers on said sleeve guided in the grooves in said cylinder to shift at the toand fro-movement of said sleeve the reversing points of said cam effecting the reciprocating movement of said thread guide, a yoke member engaging in the radial groove of said sleeve, a slide carrying said yoke member and an eccentric adapted to drive said slide.

3. A driving mechanism for conical spools on machines for twisting especially artificial silk, comprising in combination with the conical spool, a driving axle, a cylinder on said driving axle, a helical rib on said cylinder in contact with said conical spool, a reciprocating bar between said driving axle and said spool, a thread guide fixed on said bar and extending over said helical rib, a cam on said axle adapted to impart a reciprocating movement to said thread guide and having a groove curved similarly to said helical rib to conform the reciprocating movement of said thread guide to the path of said rib, a sleeve on said driving axle shiitable in axial direction and having a radial groove, a cylinder having oblique grooves surrounding said sleeve, rollers on said sleeve guided in the grooves in said cylinder to shift at the toand fro-movement or said sleeve the reversing points of said cam effecting the reciprocating movement of said thread guide, a yoke member engaging in the radial groove of said sleeve, a slide carrying said yoke member, an eccentric adapted to drive said slide, and a worm gear adapted to impart the rotary movement to said driving axle.-

MATHIAS LENK.

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